ML20091M360
| ML20091M360 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 05/24/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-84-303-000 NCR-2318, PT21-84-303, PT21-84-303-000, NUDOCS 8406110258 | |
| Download: ML20091M360 (2) | |
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- 1 TENNESSEE VALLEY AUTHORITY d
CHATT NOOGA, TENNESSEE 374ot g0p stnut Street Tower II gdN May 24,198gf BLRD-50-438/83-30 BLRD-50-439/83-26 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - DEFECTS IN PIPE CLAMPS BY ITT GRINNELL - BLRD-50-438/83-30, BLRD-50-439/83 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector Linda Watson on April 6,1983 in accordance with 10 CFR 50.55(e) as NCR 2318. This was followed by our interim report dated May 6,1983 Related NCR 2917 was later initiated and will now be reported on with NCR 2318. Enclosed is our second interim report. We expect to submit our next report by August 30, 1984. We consider 10 CFR Part 21 to be applicable to this deficiency.' A four-week delay of this submittal was discussed with Inspector R. Carroll on April 5,1984.:
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Licensing
-Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555
- Records Cont'er (Enclosure)
Institute of Nuclear Power Operations
,1100 Circle 75 Parkway, Suite.1500 l
' Atlanta, Georgia 30339 8406110258'840524 C
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-PDR ADOCK 05000438 8
PDR i s, # -TVA BOTH ANNIVERSARY 4
g An Equal Opportunity Employer
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 a
DEFECTS IN PIPE CLAMPS BY ITT GRINNELL
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BLRD-50-438/83-30, BLRD-50-439/83-26 10 CFR 50.55(e)
NCR 2318 SECOND INTERIM REPORT Description of Deficiency TVA has encountered. the following problems with pipe clamps furnished by ITT Grinnell, Providence, Rhode Island.
1.
Four-inch pipe clamps for use with figure 211 size A sway struts, supplied per Bill.Of Material Mark Number 3BWO336-500 (Grinnell Shop Order Number EBH-517) will not tighten sufficiently on the pipe to provide firm two-point contact in order to mintain proper alignment between the-load stud and the clamping bolt. This problem was verified by the ITT.Grinnell field representative. The 75 clamps involved are to be returned to the vendor by Over, Short, Substitution, Damaged, or Defective. (OSS/D) report (refemnce Quality Control Investigation Reports (QCIRs) 8095 and 13625 and OSS/D A173571).
As part of the indicated resolution of NCR 2318, 64 of the referenced 75 clamps were returned to ITT Grinnell for rework. When the reworked clamps were returned to TVA, the clamps still could not achieve firm two-point contact. A new NCR, 2917, was initiated documenting the problem and is mferenced above.
2.
All sizes of-pipe clamps for use with figure 306/307 Mechanical Shock
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Suppressors (all sizes) were anufactured with an incorrect dimension from the load pin / bolt to end of clamp (ear) causing an interference with the " snubber." This condition was mported on QCIR 15634 and NCR 1710 as generic and numerous other QCIRs for individual items. Clamps have been or are being mworked by TVA's Division.of Construction (CONST).
3 Many sizes of figum 40 Riser Clamps, used in conjunction with pipe lugs on. horizontal runs of piping, would not. tighten sufficiently on the pipe to' provide firm two-point contact in order to mintain proper orientation on the pipe. This failure to maintain crientation causes:
(1)'the associated sway struts or snubber to exceed the 40 tolerance resulting in binding, and (2)'the clamp to pipe lug gaps to be inconsistent due to
-irregularities in the clamp width (refemnce QCIR 13844 and NCR 1633).
Clamp spacers were shortened.in accordance with ITf Grinnell procedure PE-425; however, the problem still exists on many clamps. These are being
' handled on a case-by-case basis.
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4.
Two 1/22 pip 2 c1:mpa for us; with figure 211 sizo A sway struts, supplied per Bill of Mat; rial 3BWo336-504 (Grinnall Shop Order numbara EBH-149, o
EBH-521, and EBH-531) were fabricated such that the clamp bolt head falls in the area where the pipe is to be physically located, thereby i
interfering with placement. Also, other dimensions do not meet fabrication drawings (reference QCIR 29835 and NCR 2252).
i 5.
The pipe clamp, item 6 of drawing 1KE-MPHG-0765, sheet 2, revision 1 (Detail A) varies in thickness from 1.509" to 1 350" as measured across the ears of the clamp. As the drawing calls for a stock thickness of 1.500 inches the item is out of allowable tolerance (reference QCIR 28005 and NCR 2265).
6.
A 32" pipe clamp, item 1.c of drawing 1SM-MPHG-0295, R3, will not tighten down on the pipe. The resultant installed position leaves approximately a 1/2" gap between the clamp and the pipe at a point 900 to the clamp split line (reference QCIR 30588 and Support Modification Request 13845).
7.
A 30" pipe clamp, item 1 of drawing 1SV-MPHG-0261, sheet 2, revision 1, will not tighten down sufficiently to obtain firm two-point contact with the pipe (reference QCIR 30589).
8.
A 22' pipe clamp, item 1 of drawing 2CF-MPHG-0044, sheet 2, revision 4, will not tighten down sufficiently to obtain firm two-point contact with the pipe (reference QCIR 30905).
9.
A 24" pipe clamp, item 1 on drawing 1KC-MPHG-0003, sheet 1, would not fit the pipe properly. The clamp was mturned to vendor per OSS/D A176635 (reference QCIR 4676).
10.
A 24" pipe clamp, item 1 of drawing 1KC-MPHG-0010, R4, would not fit the pipe properly due to a twist in the clamp. The clamp was returned to vendor per OSS/D A176635 (reference QCIR 4639).
These problems are suspected to be a result of design and/or mnufacturing errors by ITT Grinnell.
Interim Progress
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TVA has mturned to ITT Grinnell the 64 four-inch pipe clamps mferenced in iten 1 which were reworked by IIT Grinnell. ITT Grinnell will replace the 64 clamps and any of the remaining 11 clamps which have been installed but do not achieve firm two-point contact. TVA will submit a final report on this deficiency when ITT Grinnell informs us of the root cause of the deficiency identified on 2917 and their actions taken to prevent recurrence.
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